Published on in Vol 10 , No 5 (2021) :May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/26110, first published
.

1 Department of Obstetrics and Gynecology, University of British Columbia, Vancouver, BC, Canada
2 Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, ON, Canada